From Cppreference
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template<
class T1,
class T2
> struct pair;
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std::pair is a struct template that provides a way to store two heterogeneous objects as a single unit.
[edit] Member types
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| Member type
| Definition
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first_type
| T1
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second_type
| T2
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[edit] Member objects
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| Member name
| Type
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first
| T1
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second
| T2
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[edit] Member functions
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| constructs new pair
(public member function)
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| assigns the contents
(public member function)
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| swaps the contents
(public member function)
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[edit] Non-member functions
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| creates a pair object of type, defined by the argument types
(function template)
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| lexicographically compares the values in the pair
(function template)
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| specializes the std::swap() algorithm
(function template)
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| accesses an element of a pair
(function template)
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[edit] Helper classes
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| obtains the size of a pair
(class template specialization)
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| obtains the type of the elements of pair
(class template specialization)
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